f2fs: call f2fs_balance_fs outside of locked page

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[ Upstream commit bdf0329924 ]

Otherwise, we can hit deadlock by waiting for the locked page in
move_data_block in GC.

 Thread A                     Thread B
 - do_page_mkwrite
  - f2fs_vm_page_mkwrite
   - lock_page
                              - f2fs_balance_fs
                                  - mutex_lock(gc_mutex)
                               - f2fs_gc
                                - do_garbage_collect
                                 - ra_data_block
                                  - grab_cache_page
   - f2fs_balance_fs
    - mutex_lock(gc_mutex)

Fixes: 39a8695824 ("f2fs: refactor ->page_mkwrite() flow")
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Jaegeuk Kim 2019-12-03 15:53:16 -08:00 • committed by Greg Kroah-Hartman

parent 87ca739b1e

commit c0be016cba

1 changed files with 4 additions and 3 deletions

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fs/f2fs/file.c

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